Science of meditation
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Intellect is fire. Mind is the fuel. Soul is the oxygen.
It is the quality of fuel which decides how brilliant is the intellect. Oil in an earthen pot is fuel but the flame with its pleasing light and aroma is intellect. Fuel is a hydrocarbon (carbon and hydrogen). These elements (hydrogen and carbon) of mind or fuel cannot directly combine with soul or oxigen. Mind needs intellect for its breakdown and merge with soul.
This means, by use of intellect, carbon turns into carbon dioxide (CO2) and hydrogen becomes water or dihydrozen oxide (H2O). A fuel is a hydrocarbon which is inflammable but after it gets in contact with intellect for purification, mind or fuel breaks down into carbondioxide and water which are non inflammable. Oxidation or activity of soul is, what actually the intellect has for fuel (mind).
This is the most simplified explanation about nature of mind and intellect and soul. Soul is oxigen, present universally. Intellect is a flame with heat and light. Mind is fuel which is inflammable but it cannot itself convert into light by combining with oxigen or universal soul.
Mind like any fuel is of different types. Diesel and petrol and plastic and oil from plants differ. Mind (fuel) is made of body (carbon) and senses(hydrogen). Difference in different fuels is only because of difference in composition of hydrogen and carbon and some impurities ( could be aroma or poisonous element). Within a fuel or mind, body and senses are carbon and hydrogen respectively. Sensibility ( hydrogen) is least bodily ego (carbon) and high bodily ego is least sensible. For example, terrorists have their mind highly obnoxious and intellect make it dangerous. These terrorists such as emperor Ashoka turned into saints by intellectual transformation. Intellect does its best but has no choice as it has to act whatever be the given quality of mind.
Intellect breaks the components ( senses and body) of mind. Hydrogen and carbon are tightly bonded and it is role of fire to make carbon go with oxigen separately and hydrogen go with oxigen separately. The breakdown of mind by intellect is called meditation.
Senses ( hydrogen) and body (carbon) are therefore first step in the study for a right kind of fuel or the mind. Cleaning of body and senses by breathing exercises or observation of thought are therefore important for a good mind. If mind is made good, the fuel is right. It will then get purified by intellect and soul, sooner than later.
Oxigen in breath is actually the soul but mind needs also the awareness of intellect for a regulatory control of the breath for its (mind) purification. With the end of mind (fuel), intellect (fire) also ends. Only soul (oxigen) which is universal exists.
Regards
K G